1.You received invoices from Wengo Industries dated Jan 20 for $2800, Jan 25 for $4200, and Feb 1 (non-leap-year) for $1500. You have also made a payment of $4800 on Jan 27th. The invoices all have terms of 3/10, n/30.

What is the outstanding balance on the January 25th invoice after the January 27th payment?

2. On February 1, 2020, you put $1500 into a TFSA (savings account) at a rate of

2.1% /annum.
What amount of interest did you earn by December 31, 2020?